[PATCH] D30991: [Driver] Fix cross compiling with Visual Studio 2017

[Hamza Sood via Phabricator via cfe-commits]

hamzasood updated this revision to Diff 92019.
hamzasood added a comment.

- Added an assertion in Command::Execute to ensure the environment vector is null-terminated before using it.
- Split Command::setEnvironment so that there's an overload to specifically handle the case where the input vector is to be copied in. While this adds a small amount of extra code complexity, it allows us to reduce the worst case from two copies (copy into the function, re-allocate/copy when appending the null-terminator) to just one. Considering the non-trivial size of environment blocks (and that we're already quite inefficient by going from UTF16 -> UTF8 -> UTF16), I think it's worth the few extra lines of code. However it's simple to revert if anyone disagrees.


https://reviews.llvm.org/D30991

Files:
  include/clang/Driver/Job.h
  lib/Driver/Job.cpp
  lib/Driver/ToolChains/MSVC.cpp

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